This is my 1938 Humber Pullman we just bought it two weeks ago. It Given to the services or Requisitioned and was used in WW2 as a staff car and came out of the services in 1946. The RAF, Army and Navy used these Humbers and i think the US Army had some. I think my Humber was used by the Royal Navy as it was dark blue then and reg in Exeter for most of its life untill 1978. was used in Agatha Christies film Appointment with Death by that time is painted Army Green. There is a photo of one with reg number RAF 181850 in the book British Cars of the 1940s-1946 by Bart H.Vanderveen. the number on the my Humber was taken from an open top Humber for the film.
